Readme

• Regular expressions - basics
• Regular expressions - advanced
• Your best friend for this project is http://rubular.com/
• Understand a famous developer joke: "Use a regular expression against a problem: now you have 2 problems"
• Learn by doing with https://www.regexone.com/

For this project, you have to build your regular expression using Oniguruma, a regular expression library that which is used by Ruby by default. Note that other regular expression libraries have sometimes different properties.

Because the focus of this exercise is to play with regular expressions (regex), here is the Ruby code that you should use, just replace the regexp part, meaning the code in beetween the //:

sylvain@ubuntu$ cat example.rb
#!/usr/bin/env ruby
puts ARGV[0].scan(/127.0.0.[0-9]/).join
sylvain@ubuntu$
sylvain@ubuntu$ ./example.rb 127.0.0.2
127.0.0.2
sylvain@ubuntu$ ./example.rb 127.0.0.1
127.0.0.1
sylvain@ubuntu$ ./example.rb 127.0.0.a

##Requirements

• Allowed editors: vi, vim, emacs
• All your files will be interpreted on Ubuntu 14.04 LTS
• All your files should end with a new line
• A README.md file, at the root of the folder of the project, is mandatory
• All your Bash script files must be executable
• The first line of all your Bash scripts should be exactly #!/usr/bin/env ruby
• All your regex must be built for the Oniguruma library